Change the way to check for a masked constant.

oscargus · rcomer · web-flow · commit 8cd356ae1ace · 2022-12-19T11:07:35.000+01:00
Co-authored-by: Ruth Comer &lt;10599679+rcomer@users.noreply.github.com&gt;
diff --git a/lib/matplotlib/ticker.py b/lib/matplotlib/ticker.py
@@ -623,7 +623,7 @@ def set_powerlimits(self, lims):
 
     def format_data_short(self, value):
         # docstring inherited
-        if isinstance(value, np.ma.core.MaskedConstant):
+        if value is np.ma.masked:
             return ""
         if isinstance(value, Integral):
             fmt = "%d"
